The fan running first then the burner is normal. The fan running after the burner shuts off is normal. What you don’t say is the inside temperature when you set the thermostat for heat. It sounds as if you are setting it just above the inside temperature to get it to call for heat. If that’s the case and the register is very close to the thermostat then it will run only briefly. Try setting the thermostat 10 den higher and see what happens. I don’t know how close is close but 2 registers close to the thermostat will effect the thermostat even directed away, het rises. Hope this helps.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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